You are correct jazman. I did some more research and they are glazed porcelain, hard to see the glaze. They do have a texture, like little craters on the tile. I went ahead and grouted them. Turned out good, some grout stuck in the craters but a little scrubing got that out. Is there a better way to get what grout gets in the craters out? And now I need to seal the whole counter. What is a good sealer? I got a little confused when I was looking at them. Do I want a penetrating sealer or just a regular sealer? Thanks for your help